E. Setiyowati, W. Widayati, S. Samsudi, and E. Sulistiyowati, “The Effect of Closed Suction System Use on the Incidence of Ventilator-Associated Pneumonia (VAP) in Patients Receiving Mechanical Ventilation: A Systematic Literature Review”, IJGHR, vol. 8, no. 3, pp. 159–168, Jan. 2026.